B-k Medical A/s

J&oslash;rgen Arendt Jensen

Svetoslav Ivanov Nikolov

The two-dimensional velocity vector using a pulsed ultrasound field can be determined with the invention. The method uses a focused ultrasound field along the velocity direction for probing the moving medium under investigation. Several pulses are emitted and the focused received fields along the velocity direction are cross-correlated. The time shift between received signals is found from the peak in the cross-correlation function and the velocity is thereby determined.

Vector velocity estimation using directional beam forming and cross correlation

A method and apparatus for recursive ultrasound imaging using a Synthetic Transmit Aperture and by which a new frame is created at every pulse emission. In receive, parallel beam forming is implemented. The beam formed RF data is added to the previously created RF lines. To keep the level of the signal, the RF data obtained previously, when emitting with the same element, is subtracted from the RF lines. Up to 5000 frames/sec can be achieved for a tissue depth of 15 cm with a speed of sound of c&equals;1540 m/s. The high frame rate makes continuous imaging data possible, which can significantly enhance flow imaging. A point spread function 2&deg; wide at &minus;6 dB and grating lobes of &lE;&minus;50 dB is obtained with a 64 elements phased array with a central frequency f &equals;3 MHz using a sparse transmit aperture using only 10 elements (N &equals;10) during pulse emission. The corresponding images have the quality of a dynamically focused image in transmit and receive. The dynamic focusing gives a small sampling volume and the capability to view small blood vessels and obtain the velocity profiles within the vessels with lower variance than with normal imaging.

Growing community of inventors

Lyngby, Denmark

Jørgen Arendt Jensen

Growing community of inventors

Lyngby, Denmark

J&oslash;rgen Arendt Jensen

Jørgen Arendt Jensen